Setting aside the wisdom of that response, and my surprise at
discovering that the distribution even *permits* you to ship your own
copy of certain libraries — *especially* security-critical libraries —
in your own package instead of using the system's version.... doesn't
that mean you should be shipping your own version of things like
certutil and modutil, given that you now not only have your own copy of
the libraries, but you even have a speshul different database format to
the one that the system NSS uses, so you aren't even compatible with
/usr/bin/certtool.

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https://bugs.launchpad.net/bugs/1648616

Title:
  Firefox uses its own version of NSS, incompatible with system version

Status in firefox package in Ubuntu:
  Invalid
Status in thunderbird package in Ubuntu:
  New

Bug description:
  Because of bug 1647285 I need to install corporate SSL CAs into the
  database of each NSS-using application individually. Unfortunately it
  doesn't seem to work for Firefox. Not only does Firefox ship with its
  *own* version of NSS instead using the system's version, but it even
  seems to be configured very differently.

  Firefox appears to use the legacy Berkeley DB database for its
  softokn, in key3.db/cert8.db. However, the system's certutil won't
  work with that legacy format:

  $ certutil -d ~/.mozilla/firefox/default.default/ -L
  certutil: function failed: SEC_ERROR_LEGACY_DATABASE: The certificate/key 
database is in an old, unsupported format.

  I can force it to use the SQL database in key4.db/cert9.db by running
  with NSS_DEFAULT_DB_TYPE=sql, and then I *can* install trusted CAs
  with certutil. But actually, it's much simpler to just make a symlink
  from firefox's own special copy of the SSL trust roots in
  libnssckbi.so, to the system's p11-kit-trust.so — thus making Firefox
  honour the system trust configuration.

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